skbuff: remove unused skb_zcopy_abort function

skb_zcopy_abort() has no in-tree consumers, remove it.
Signed-off-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/linux/skbuff.h

@@ -1490,17 +1490,6 @@ static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy)
 	}
 }
 
-/* Abort a zerocopy operation and revert zckey on error in send syscall */
-static inline void skb_zcopy_abort(struct sk_buff *skb)
-{
-	struct ubuf_info *uarg = skb_zcopy(skb);
-
-	if (uarg) {
-		sock_zerocopy_put_abort(uarg, false);
-		skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG;
-	}
-}
-
 static inline void skb_mark_not_on_list(struct sk_buff *skb)
 {
 	skb->next = NULL;